Digital BW, The Print

The chemistry sounds great to me, too. My carpet guy uses a foaming alcohol
mix to remove my many ink boo-boos. I couldn't find the post quickly, but I
believe someone mentioned using paper or paper towel soaked in Windex and
then dragging the head over it. I have ruined two 7000 heads and one 7800
head by doing this. In all cases, the same one or two nozzles would simply
never fire, even after trying every other method for a couple weeks,  and I
had to replace the heads. I'm pretty certain that I jammed paper towel
fibers or something into a couple of nozzles. Whenever I've been compelled
to do it, I do it gently with a lint-less PecPad. I would consider this a
last resort as I do the syringe. In more than one case, the little hose from
the syringe came loose and I sprayed the head circuit board, once blowing up
the head circuit board, and another time blowing the head and the machine's
main board. Over the years I've blown up at least 5 main boards and other
expensive components by being a bit too aggressive and curious. I like
blowing things up, but after a while one must grow up. Sigh.
 
Tom
 
 
  
I can only say that I have used Windex W/ammonia, 10%clear ammonia, a
mixture of ethyl alc and propelene glycol, as well as the 50:50 denatured
alc/H20. All have worked, dependent on the severity of the clog and the time
left in the head. The last mix(denatured ethyl/H2O) removed traces of inks
even after the others came through clear.
It was the final solution to clearing a totally clogged set of EP7500 heads
that had been left for dead as unusable and had been setting open to the air
for many months before I acquired the machine. It's also the only thing that
I have ever used that completely removed all color from the long tubing
between the cart station and heads on the large format machines I have.It
does not seem to have caused any problems with the heads and they are now
working very well.

Having said that, I wouldn't recommend using a syringe on the heads with any
of these mixtures except as a last resort. One could use any of the above
mixtures in an old cartridge, even one with ink residues in it, and let the
full cart set awhile in the machine and run a few cleaning cycles over a
period of time etc. Only if nothing else worked and there was nothing to
lose would I force fluid through with a syringe.

If I had to give an opinion of effectiveness for all these my personal
ranking would be consistent with the order I listed above.

Hope this helps and is useful.
Regards,
Duane

--- In DigitalBlackandWhiteThePrint@yahoogroups.com
<mailto:DigitalBlackandWhiteThePrint%40yahoogroups.com> , "Un Globe
Trotteur" <unglobetrotteur@...> wrote:
>

> Would the 50:50 mix of straight denatured alcohol(ie:ethyl) with distilled
H2O do a better job than Windex for pigment ink?
> 
> Thanks for any input. I really would like to have this printer working. It
looks like a very good printer.
> Pierre
> 



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